Tropical Cyclone Regions

Tropical Cyclone Info







 

Welcome to the Northern Indian Ocean Tropical Cyclone page of Hurricane Alley. 

The information source used for the graphs presented on this page is the "Best Track" files from the Joint Typhoon Warning Center. 

Current Tropical Activity -

 From the Joint Typhoon Warning Center

REGION 10 - FAQ--  BAY OF BENGAL
Areal coverage - area north of 0° and between 100°E and 80°E.

Names are rarely issued. The cyclones are numbered.

Season - May through November
Average number of tropical cyclones in a year -- 3.6
Average number of tropical cyclones in a "normal season" -- 2.7
Most active month -- October - average 1 storms/year
Most active period -- October through December - 64.58% of all storms
Most storms in a single season - 9 in 1992
Fewest storms in a single season -- 0 in 2004

The graphs below have been created using the "best track" data from 1979 to 2006 courtesy of JTWC. Click on the graph to enlarge.

Tropical Cyclones by Year	Tropical Cyclones by Month	Tropical Cyclone Probability by Month	Tropical Cyclone Passing to Arabian Sea

Cyclone rating designation process --  MSW Averaging Period: 10 minutes
      Tropical LOW - term is used to describe disturbances ranging from
         diffuse, ill-defined low-pressure areas all the way to well-
         organized tropical depressions with MSW up to 33 kts
      Tropical Cyclone - MSW in range of 34-63 kts/ Dvorak rating ranging
         from a strong T2.5/weak T3.0 to T4.0
      Severe Tropical Cyclone - MSW exceeding 63 kts/ Dvorak T4.5 or
         higher

     Warnings in the Bay of Bengal Region are issued by the Joint Typhoon Warning Center. 

TCWC = Tropical Cyclone Warning Center
MSW = Mean Surface Wind
JTWC = Joint Typhoon Warning Center

REGION 11 - FAQ--  ARABIAN SEA
Areal coverage - area north of 0° and between 80°E and 30°E.

Names are not issued. The cyclones are numbered.

Season - May through November
Average number of tropical cyclones in a year -- 1.4
Average number of tropical cyclones in a "normal season" -- 1.3
Most active month -- November - average .4 storms/year
Most active period -- September-November - 66.67% of all storms
Most storms in a single season - 5 in 1998
Fewest storms in a single season -- 0 in several, most recent 2005

The graphs below have been created using the "best track" data from 1979 to 2006 courtesy of JTWC. Click on the graph to enlarge.

Tropical Cyclones by Year	Tropical Cyclones by Month	Tropical Cyclone Probability by Month

Cyclone rating designation process --  MSW Averaging Period: 10 minutes
      Tropical LOW - term is used to describe disturbances ranging from
         diffuse, ill-defined low-pressure areas all the way to well-
         organized tropical depressions with MSW up to 33 kts
      Tropical Cyclone - MSW in range of 34-63 kts/ Dvorak rating ranging
         from a strong T2.5/weak T3.0 to T4.0
      Severe Tropical Cyclone - MSW exceeding 63 kts/ Dvorak T4.5 or
         higher

     Warnings in the Arabian Sea Region are issued by the Joint Typhoon Warning Center. 

TCWC = Tropical Cyclone Warning Center
MSW = Mean Surface Wind
JTWC = Joint Typhoon Warning Center